To be honest with you D, Jericho was not the first choice to become the first ever undisputed champion from what I gather that honor was suppose to go too Chris Benoit but his neck injure keep him from doing it so Jericho was given that honor.
In truth I think Jericho deserve it more than the Rock or Austin because those two had already been champion many times over and I believe that when Jericho won it, the WWE fans were caught off guard by Jericho becoming champion. It was a smart and good move for the WWE at the time because Jericho was hot during that period and no one could touch him during that period of time.